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b in (-oo:+oo)
2*b-(6*b)-4 = 20 // - 20
2*b-(6*b)-20-4 = 0
2*b-6*b-20-4 = 0
-4*b-24 = 0 // + 24
-4*b = 24 // : -4
b = 24/(-4)
b = -6
b = -6
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